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No Windows Defender Service

I've had this issue for a couple weeks now, my Windows Defender service is not located in the services.msc file. So I get the 0x80070424 error stating that Windows Defender is not an installed service. I did some searching online and I saw a forum where there was a similar issue with Defender not working, except he was running on the Vista OS,here. The Microsoft tech person gave step-by-step instructions on how to manually add registry keys to restore the Defender service. I was wondering if these instructions, along with the "fix.reg" file that the tech person said needed to be used, would also work with the Windows 7 OS? Also, one of the steps explained that I would need to create a notepad file to paste the registry key info into. She said that "notepad D:\fix.reg" would have to be typed in the start search bar to create it. Then, after pasting the registry info, it should be saved as "D:\fix.reg". I'm not quite sure what this means, since it looks like she's directing me to save it onto my D drive, then run it from there. So yeah, I have these 2 questions: 1.) Can these instructions work for Windows 7? And 2.) What is meant by saying to save it as "D:\fix.reg". Thanks.

I'm aware that Windows Defender isn't all too great but the computer that this problem is on is a work computer. Since this computer isn't mine per se I'd like to get it back to the original working order.

Since Windows 7 has Defender already installed I'm unable to uninstall/reinstall it. I realize it's something that's best left for the IT guy but I was seeing if there was a way for me to get it fixed myself since he's either out of the country on business or too busy dealing with other issues that are more pressing.

Yeah I know, which is why I haven't touched anything. I thought that an experienced member here would be able to walk me through it a bit though. I'm not at a level of an IT guy but I have worked long enough on computers to know how to do certain things and, more importantly, know what not to do.